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A pendulum consists of a small object called a bob hanging from a light cord of fixed length, with the top end of the cord

A pendulum consists of a small object called a bob hanging from a light cord of fixed length, with the top end of the cord fixed, as shown in the Figure. The bob moves without friction, swinging equally high on both sides. It moves from its turning point A through point B and reaches its maximum speed at point C.
A B C Figure CQ7.5

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